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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
<script src="../../resources/js-test-pre.js"></script>
<script src="../resources/webgl-test.js"></script>
</head>
<body>
<div id="description"></div>
<div id="console"></div>

<script>
description("Test of drawElements with out-of-bounds parameters");

var context = create3DContext();
var program = loadStandardProgram(context);

context.useProgram(program);
var vertexObject = context.createBuffer();
context.enableVertexAttribArray(0);
context.bindBuffer(context.ARRAY_BUFFER, vertexObject);
context.bufferData(context.ARRAY_BUFFER, new Float32Array([ 0,0.5,0, -0.5,-0.5,0, 0.5,-0.5,0 ]), context.STATIC_DRAW);
context.vertexAttribPointer(0, 3, context.FLOAT, false, 0, 0);

var indexObject = context.createBuffer();

debug("Test empty index buffer")
context.bindBuffer(context.ELEMENT_ARRAY_BUFFER, indexObject);
context.bufferData(context.ELEMENT_ARRAY_BUFFER, new Uint8Array([  ]), context.STATIC_DRAW);
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 3, context.UNSIGNED_BYTE, 0)");
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 10000, context.UNSIGNED_BYTE, 0)");
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 10000000000000, context.UNSIGNED_BYTE, 0)");
shouldGenerateGLError(context, context.INVALID_VALUE, "context.drawElements(context.TRIANGLES, -1, context.UNSIGNED_BYTE, 0)");
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 1, context.UNSIGNED_BYTE, 0)");
shouldGenerateGLError(context, context.INVALID_VALUE, "context.drawElements(context.TRIANGLES, 0, context.UNSIGNED_BYTE, -1)");
shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLES, 0, context.UNSIGNED_BYTE, 0)");
shouldGenerateGLError(context, context.INVALID_VALUE, "context.drawElements(context.TRIANGLES, -1, context.UNSIGNED_BYTE, 1)");
shouldGenerateGLError(context, context.INVALID_VALUE, "context.drawElements(context.TRIANGLES, 1, context.UNSIGNED_BYTE, -1)");

debug("")
debug("Test buffer with 3 byte indexes")
context.bindBuffer(context.ELEMENT_ARRAY_BUFFER, indexObject);
context.bufferData(context.ELEMENT_ARRAY_BUFFER, new Uint8Array([ 0, 1, 2 ]), context.STATIC_DRAW);
shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLES, 3, context.UNSIGNED_BYTE, 0)");
shouldGenerateGLError(context, context.INVALID_ENUM, "context.drawElements(context.TRIANGLES, 3, context.UNSIGNED_INT, 0)");
shouldGenerateGLError(context, context.INVALID_ENUM, "context.drawElements(0x0009, 3, context.UNSIGNED_BYTE, 0)"); // GL_POLYGON
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 3, context.UNSIGNED_BYTE, 2)");
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 10000, context.UNSIGNED_BYTE, 0)");
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 10000000000000, context.UNSIGNED_BYTE, 0)");
shouldGenerateGLError(context, context.INVALID_VALUE, "context.drawElements(context.TRIANGLES, -1, context.UNSIGNED_BYTE, 0)");
shouldGenerateGLError(context, context.INVALID_VALUE, "context.drawElements(context.TRIANGLES, 0, context.UNSIGNED_BYTE, -1)");
shouldGenerateGLError(context, context.INVALID_VALUE, "context.drawElements(context.TRIANGLES, -1, context.UNSIGNED_BYTE, 1)");
shouldGenerateGLError(context, context.INVALID_VALUE, "context.drawElements(context.TRIANGLES, 1, context.UNSIGNED_BYTE, -1)");
shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLES, 0, context.UNSIGNED_BYTE, 4)");
shouldGenerateGLError(context, context.INVALID_VALUE, "context.drawElements(context.TRIANGLES, 0xffffffff, context.UNSIGNED_BYTE, 0)");
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 0x7fffffff, context.UNSIGNED_BYTE, 0)");
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 0x7fffffff, context.UNSIGNED_BYTE, 0x7fffffff)");

shouldGenerateGLError(context, context.NO_ERROR, "context.bufferData(context.ELEMENT_ARRAY_BUFFER, (new Uint8Array([ 3, 0, 1, 2 ])).subarray(1), context.STATIC_DRAW)");
shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLES, 3, context.UNSIGNED_BYTE, 0)");
shouldGenerateGLError(context, context.NO_ERROR, "context.bufferSubData(context.ELEMENT_ARRAY_BUFFER, 0, new Uint8Array([ 3, 0, 1]))");
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 3, context.UNSIGNED_BYTE, 0)");
shouldGenerateGLError(context, context.NO_ERROR, "context.bufferSubData(context.ELEMENT_ARRAY_BUFFER, 0, (new Uint8Array([ 3, 0, 1, 2 ])).subarray(1))");
shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLES, 3, context.UNSIGNED_BYTE, 0)");
shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLES, 0, context.UNSIGNED_BYTE, 0)");

debug("")
debug("Test buffer with interleaved (3+2) float vectors")

var program2 = createProgram(context,
                             "attribute vec3 aOne;" +
                             "attribute vec2 aTwo;" +
                             "void main() { gl_Position = vec4(aOne, 1.0) + vec4(aTwo, 0.0, 1.0); }",
                             "void main() { gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0); }",
                             [ "aOne", "aTwo" ]);
if (!program2) {
    testFailed("failed to create test program");
}

context.useProgram(program2);

var vbo = context.createBuffer();
context.bindBuffer(context.ARRAY_BUFFER, vbo);
// enough for 9 vertices, so 3 triangles
context.bufferData(context.ARRAY_BUFFER, new Float32Array(9*5), context.STATIC_DRAW);

// bind first 3 elements, with a stride of 5 float elements
context.vertexAttribPointer(0, 3, context.FLOAT, false, 5*4, 0);
// bind 2 elements, starting after the first 3; same stride of 5 float elements
context.vertexAttribPointer(1, 2, context.FLOAT, false, 5*4, 3*4);

context.enableVertexAttribArray(0);
context.enableVertexAttribArray(1);

var ebo = context.createBuffer();
context.bindBuffer(context.ELEMENT_ARRAY_BUFFER, ebo);
context.bufferData(context.ELEMENT_ARRAY_BUFFER, new Uint16Array(
    [ 0, 1, 2,
      1, 2, 0,
      2, 0, 1,
      200, 200, 200,
      0x7fff, 0x7fff, 0x7fff,
      0xffff, 0xffff, 0xffff ]),
    context.STATIC_DRAW);

shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLES, 9, context.UNSIGNED_SHORT, 0)");

// invalid type arguments
shouldGenerateGLError(context, context.INVALID_ENUM, "context.drawElements(context.TRIANGLES, 9, context.FLOAT, 0)");
shouldGenerateGLError(context, context.INVALID_ENUM, "context.drawElements(context.TRIANGLES, 9, context.SHORT, 0)");
shouldGenerateGLError(context, context.INVALID_ENUM, "context.drawElements(context.TRIANGLES, 9, context.UNSIGNED_INT, 0)");

// invalid operation with indices that would be valid with correct bindings
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 9, context.UNSIGNED_SHORT, 1000)");
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 12, context.UNSIGNED_SHORT, 0)");
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 15, context.UNSIGNED_SHORT, 0)");
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 18, context.UNSIGNED_SHORT, 0)");
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 3, context.UNSIGNED_SHORT, 2*15)");

shouldGenerateGLError(context, context.INVALID_VALUE, "context.drawElements(context.TRIANGLES, 0xffffffff, context.UNSIGNED_SHORT, 0)");
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 0x7fffffff, context.UNSIGNED_SHORT, 0)");

shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLES, 0, context.UNSIGNED_SHORT, 0)");

// invalid operation with offset that's not a multiple of the type size
shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLES, 6, context.UNSIGNED_SHORT, 0)");
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 6, context.UNSIGNED_SHORT, 1)");
shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLES, 6, context.UNSIGNED_SHORT, 2)");

// invalid operation if no buffer is bound to ELEMENT_ARRAY_BUFFER
context.bindBuffer(context.ELEMENT_ARRAY_BUFFER, null);
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 6, context.UNSIGNED_SHORT, 0)");
context.bindBuffer(context.ELEMENT_ARRAY_BUFFER, ebo);

debug("")
debug("Test buffer setting attrib 0 to a buffer too small and disable it.");
var smallVBO = context.createBuffer();
shouldBeNonNull('smallVBO');
context.bindBuffer(context.ARRAY_BUFFER, smallVBO);
context.bufferData(context.ARRAY_BUFFER, 1, context.STATIC_DRAW);
context.vertexAttribPointer(0, 3, context.FLOAT, false, 0, 0x10);
context.disableVertexAttribArray(0);
shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLES, 6, context.UNSIGNED_SHORT, 2)");
context.bindBuffer(context.ELEMENT_ARRAY_BUFFER, null);
shouldGenerateGLError(context, context.INVALID_OPERATION, "context.drawElements(context.TRIANGLES, 6, context.UNSIGNED_SHORT, 2)");
debug("")
successfullyParsed = true;
</script>

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